I could not find any at Spangdahlem/K-town or at Chievres in Belgium; someone had suggested to me that it might be possible to special order it through AAFES but the guys at Chievres couldn't help. In the end I bought a service package (Basic Service Inclusive) through BMW IDS, at a discount relative to the European market price, and that will cover the cost of the oil when changes are required (but not top offs). So if you find something/somewhere, would be interested to hear about it.